The Basic primordial beej mantra is “om”, it is the mantra from which all the opposite mantras were born. Every single beej mantra has a certain god or goddess related to them. The categories of beej mantras are— Yog beej mantra, Tejo beej mantra, Shanti beej mantra, and Raksha beej https://www.youtube.com/watch?v=7yoEpl90KUg